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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 57: Hybrid, Organic and Perovskite Optoelectronics and Photovoltaics VIII

CPP 57.4: Vortrag

Freitag, 13. März 2026, 12:15–12:30, ZEU/LICH

Impact of additive on the morphology and electronic states of PPDT2FBT:PCBM organic solar cells — Md Moidul Islam^1,2, Hassan Ismail^1,2, Saib Qazi^1,2, Ulrich S. Schubert^1,2, and •Harald Hoppe^1,2 — ¹Laboratory of Organic and Macromolecular Chemistry (IOMC), Friedrich Schiller University Jena, Humboldtstrasse 10, 07743 Jena, Germany — ²Center for Energy and Environmental Chemistry Jena (CEEC Jena), Friedrich Schiller University Jena, Philosophenweg 7a, 07743 Jena, Germany

Among organic solar cells using PCBM as an acceptor, the donor PPDT2FBT yields one of the highest power conversion efficiencies (PCE) of nearly 10%. It has been demonstrated that the processing additive diphenyl ether (DPE) contributes to that success essentially. However, the exact mechanism responsible for the performance improvement has so far not been revealed. Therefore, we undertook a systematic study for comparing PPDT2FBT:PCBM solar cells, under variation of annealing temperatures and use of DPE. A combination of optical, electrochemical, microscopic, and further characterization methods enabled the decoding of the impact of DPE on the blend morphology. In addition, the limitation in device stability by extended morphological degradation has been revealed and strategies to overcome those are being discussed.

Keywords: PPDT2FBT; PCBM; DPE; morphology; Organic photovoltaics